Bug 67951 - No reply after loopback down-up
Summary: No reply after loopback down-up
Alias: None
Product: Networking
Classification: Unclassified
Component: IPV6 (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Hideaki YOSHIFUJI
Depends on:
Reported: 2013-12-30 12:12 UTC by Weilong Chen
Modified: 2015-04-07 12:46 UTC (History)
3 users (show)

See Also:
Kernel Version: 3.13.0-rc4
Tree: Mainline
Regression: No


Description Weilong Chen 2013-12-30 12:12:52 UTC

I did a test like this:
On host1:
1)ifconfig eth0 add fd00::3
On host2:
1)ifconfig eth0 add fd00::4
2)ping6 fd00::3

Everything went OK.

On host1:
1)ifconfig lo down;ifconfig lo up
On hsot2:
1)ping6 fd00::3

There was no reply from host1!
Comment 1 hannes 2013-12-31 01:51:24 UTC
Thank you for the report!

This was first fixed with 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f ("net IPv6 : Fix broken IPv6 routing table after loopback down-up") and broken again in a881ae1f625c599b460cc8f8a7fcb1c438f699ad ("ipv6: don't call addrconf_dst_alloc again when enable lo").

You could fix this by adding the local route again:

ip -6 r a local fd00::3 dev lo

I hope I can come up with a fix shortly.
Comment 2 Weilong Chen 2013-12-31 05:56:48 UTC
It works good,thanks!
Comment 3 Alan 2014-01-15 11:34:49 UTC
sorry closed wrong bug number
Comment 4 Weilong Chen 2014-01-26 09:45:40 UTC
Comment 5 Jiri Slaby 2015-04-07 12:46:43 UTC

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